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How to buy a house that will actually pass as an adult family home
Most people looking at adult family homes for sale in Washington are shopping for the wrong things. Here is what the state actually measures, which houses quietly fail, and the one decision that caps your income for the next three years.
The short version. Zoning is not your problem, the state already protects you. Bedrooms are measured in usable square feet, not bedroom count. One toilet per five people including your own family disqualifies more houses than anything else. And whether you can ever grow to eight beds is decided the day you buy, not the day you apply.
Make one phone call before you write an offer
Call the permitting office for the city or county the house sits in, give them the address, and tell them you intend to operate a licensed adult family home there. Ask what they will require.
Every adult family home needs a local building code inspection from the jurisdiction the house is in, and the requirements genuinely differ between cities. A house you have already committed to that cannot pass, or that needs five figures of work to pass, is the worst outcome in this entire process. One phone call, before earnest money, prevents it.
Do this before the inspection contingency, not after. You are not asking permission. You are asking what it will cost.
Zoning is not the obstacle people think it is
This is the fear I hear most, and it is largely solved for you by state law. Under RCW 70.128.140, an adult family home must be considered a residential use of property for zoning purposes, and is a permitted use in all areas zoned for residential or commercial purposes, including areas zoned for single family dwellings.
Read that again if you have been told otherwise. You do not need commercial zoning. You do not need a special permit to live in a neighborhood. A city cannot zone you out of single family areas.
The same statute sets the standard you are held to: local licensing, zoning, building and housing codes, and state and local fire safety regulations, as they pertain to a single family residence. Not as they pertain to a nursing home. That distinction is worth thousands of dollars and it is the reason a normal house can become a licensed care home at all.
What it does not do is exempt you from the building code. It just tells you which building code applies.
Bedrooms are measured in square feet, not in bedroom count
A listing that says four bedrooms tells you almost nothing. Here is what the state measures, under WAC 388-76-10690:
- Single occupancy: at least 80 square feet of usable floor space.
- Double occupancy: at least 120 square feet of usable floor space.
- That measurement excludes the floor space taken by toilet rooms, closets, lockers, wardrobes and vestibules.
The exclusion is the part people miss. A bedroom listed at 90 square feet with a decent closet may be under 80 once the closet comes out, and it stops being a resident bedroom. Walk with a tape measure, not a listing sheet.
WAC 388-76-10685 adds the rest of the test. Each resident bedroom must be an outside room that allows natural light, so no interior converted den. No more than two residents to a bedroom. Every resident, including anyone using a wheelchair or walker, must have direct, unrestricted and free access from the bedroom through doors, hallways and corridors to the common areas and bathrooms. Each bedroom needs a closet or wardrobe or reasonable clothes storage, and a call bell or another way to alert staff in an emergency.
That access clause is where narrow hallways and tight door frames end the conversation. Standard interior doors in older houses are often 28 or 30 inches. A wheelchair generally needs more. Widening a door is cheap. Widening a hallway is not.
The bathroom rule that quietly kills the most houses
This is the one I wish someone had put in front of us early, from WAC 388-76-10780:
One accessible indoor flush toilet for each five persons, including residents and household members who live in the home.
Household members counts you. It counts your spouse. It counts your children. So a six bed home run by a family of three is nine people, which needs two toilets, not one. A six bed home where you and your partner also live is eight people, which still needs two. Most people do this math for the first time after they have bought.
There is a second condition that rules out a very common layout. For homes licensed after July 1, 2007, residents must be able to reach toilets and bathing facilities without passing through another person's room. Any bathroom reachable only through a bedroom, the classic ensuite or jack and jill arrangement, does not count toward your ratio. Homes licensed after August 1, 2023 must satisfy both the ratio and the privacy condition together.
So when you tour, do not count bathrooms. Count bathrooms a stranger could reach from the hallway.
The evacuation rule decides which residents you can accept
This is the rule that quietly sets your ceiling on revenue, and almost nobody looks for it while house hunting. Under WAC 388-76-10865, the home must be able to evacuate every resident to a safe location outside the home in five minutes or less, and residents cannot be required to use elevators, chairlifts or platform lifts to do it. Residents who require assistance with evacuation must have a path via an emergency exit to the safe location that does not require the use of stairs.
Translate that into house shopping. Every bedroom you intend to use for a resident who cannot self evacuate has to be on a level with a stair free path out of the building. A beautiful house with four bedrooms upstairs and one down has, for practical purposes, one bedroom for a higher need resident.
And higher need residents are the ones who pay more. A split level or a daylight basement with a grade level exit can be worth far more than the same square footage on a second floor. When you compare two houses at the same price, count the ground level bedrooms with their own way out, and compare those numbers instead.
One more thing worth checking on the walkthrough: a stair free path out of the building is not the same as a stair free path to the sidewalk. Decks with a step down, garages with a lip, and side yards with a slope all show up here.
Buy for year three, not for month one
A standard adult family home license covers more than one but not more than six adults. But Washington allows seven or eight beds with department approval, and the requirements for that, under RCW 70.128.066, are worth reading before you buy rather than after:
- At least 24 months since your initial license was issued.
- Licensed for six residents for at least 12 months before applying.
- Two full inspections with no enforcement actions.
- Demonstrated financial solvency and management experience.
- A residential sprinkler system in place, so the home can serve residents who need help evacuating.
- Written attestation that the extra beds will not harm current residents, plus 60 days notice to residents before the seventh moves in.
- Local jurisdiction notification, fees paid, and a department inspection.
Two of those you earn with time and a clean record. But the sprinkler system and the physical layout are decided the day you sign. Retrofitting sprinklers into a finished, occupied home is dramatically more expensive and more disruptive than buying a house that already has them, or one where the plumbing and attic access make it straightforward.
Going from six beds to eight is a 33 percent increase in capacity on the same mortgage, the same land, and largely the same overhead. If two houses are close on price, the one that can get there is not slightly better. It is a different business.
The costs that turn up after closing
These are the ones I watch for, roughly in order of how often they wreck a budget:
- Septic. If the property is not on sewer you need a septic inspection, and capacity is rated for a number of bedrooms and occupants. A septic system sized for a family may not be sized for six residents plus staff plus your household. This can be a five figure surprise.
- Doors and hallways to meet the unrestricted access requirement, including for wheelchairs and walkers.
- A second bathroom if the toilet ratio does not work with your own family counted in.
- Grade level egress from the bedrooms you plan to use for assisted evacuation residents.
- Sprinklers, if you ever intend to reach seven or eight beds.
- Floor plans for each level, which the state requires as part of your application.
- The empty months. A licensed home with no residents still carries the mortgage. Budget for it. This is covered properly in what it really costs to open.
Not sure whether a specific house will work?
Send me the listing before you write the offer. I will go through it against the rules on this page and tell you plainly what I think passes, what would need work, and what I would walk away from. No charge, and no call unless you want one.
Your walkthrough checklist
Print this, or keep it open on your phone. Ten minutes in the house answers most of it.
- Measure every bedroom you would use. Note the number without the closet. Is it 80, or 120 for a shared room?
- Does every one of those bedrooms have a real exterior window for natural light?
- Count hallway toilets, the ones reachable without going through somebody's bedroom. Now add your own household to the resident count and divide by five.
- Measure the narrowest hallway and the narrowest bedroom door on the route to the bathroom and the common area.
- Which bedrooms have a stair free path all the way to the street, not just to the back deck?
- Sewer or septic? If septic, what is it rated for and when was it last inspected?
- Is there a sprinkler system, and if not, is there attic access and water service that would make one practical later?
- Where would staff park, and where would a family visiting park?
- What is the drive time to the nearest hospital? Discharge planners refer nearby, and that matters more than most people expect.
- Call the permitting office with the address. Ask what they will require.
When I would walk away
Being honest about this saves people more money than any tip above. I would walk from a house where the only path to a second toilet is a major plumbing move, where the bedrooms that meet square footage are all upstairs, where the hallways cannot take a wheelchair without structural work, or where the septic is undersized and the lot has no room for a new drain field.
None of those are impossible. They are just expensive enough that you should buy a different house instead, and there is always a different house.
What this guide does not do
It does not replace the local permitting office, a licensed home inspector, or a septic professional. Rules change and cities interpret them differently. Everything here is cited so you can check it yourself, and you should, especially before you spend money. If a source I link contradicts what you are told locally, the local jurisdiction is the one holding the pen.
Common questions
Can a city stop me from opening an adult family home in a residential neighborhood?
No. RCW 70.128.140 makes an adult family home a residential use of property for zoning purposes and a permitted use in all areas zoned residential or commercial, including single family zones. The city can still enforce building and fire codes as they apply to a single family residence.
How many bathrooms does a six bed adult family home need?
At least one accessible indoor flush toilet for every five people, counting residents and any household members living in the home. Six residents alone need two. Six residents plus a family living there also needs two, and more household members can push you to three. Bathrooms reachable only through a bedroom do not count for homes licensed after July 1, 2007.
How big does a bedroom have to be?
80 square feet of usable floor space for one resident, 120 for two, and the measurement excludes toilet rooms, closets, lockers, wardrobes and vestibules. No more than two residents to a bedroom, and it must be an outside room with natural light.
Can residents sleep upstairs or in a basement?
It depends on the resident. The home must evacuate everyone in five minutes or less, and residents who need help evacuating must have a path to safety that does not require stairs, elevators, chairlifts or platform lifts. In practice that means your higher need residents need bedrooms with a stair free way out.
How do I get to seven or eight beds?
Under RCW 70.128.066 you need 24 months since your initial license, at least 12 months licensed for six, two full inspections with no enforcement actions, demonstrated financial solvency and management experience, a residential sprinkler system, written attestation that current residents will not be harmed, and 60 days notice to residents. Buy with that in mind, because sprinklers and layout are far cheaper to plan for than to retrofit.
Should I buy or lease?
Both work, and plenty of good homes are leased. What matters is that whoever owns the building will allow the modifications you need, in writing, before you commit. A landlord who will not let you widen a door or add a bathroom has effectively capped your license.
Where this applies
These are Washington state rules, so they apply everywhere in the state. The part that varies is the local building code inspection, which comes from your city or county. That means Seattle, Bellevue, Kent, Renton, Federal Way, Auburn, Kirkland, Redmond, Bothell, Shoreline, Lynnwood, Everett, Marysville, Edmonds, Mill Creek, Tacoma, Lakewood, Puyallup, Spokane, Spokane Valley, Vancouver, Olympia, Lacey, Kennewick, Richland, Pasco, Yakima, Bellingham and Bremerton can each ask for something slightly different. King, Snohomish, Pierce, Spokane, Clark, Thurston, Kitsap, Whatcom and Benton counties are where most of Washington's licensed homes sit, and where most of the houses worth looking at come up for sale.
Once you own it
Buying well is the hard part, and it is the part with the least written about it. After that the sequence is fairly well worn: the license requirements in order, the 54 hour administrator course, the liability insurance the state requires, and then the part that surprises everyone, which is that a licensed home with empty beds is still an empty house. That is covered in the full start to finish guide.